CONFIG: Set default value of CONFIG_MAX_LCORES to 128

Set CONFIG_MAX_LCORES=128 in CONFIG. This will ensure SPDK_CONFIG_MAX_LCORES
is always be defined to a value. Previously SPDK_CONFIG_MAX_LCORES was
defined with no value unless the value was overridden. This is needed
for systems with more than 128 cores.

Fixes: #3425

Change-Id: Iaa13aad0d57df58f3c508285c4db56f284d7cc95
Signed-off-by: Michael Piszczek <mpiszczek@ddn.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/24004


Reviewed-by: Jim Harris <jim.harris@samsung.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>